Vanuatu is about 249 times bigger than Bouvet Island.

Bouvet Island is approximately 49 sq km, while Vanuatu is approximately 12,189 sq km, making Vanuatu 24,776% larger than Bouvet Island.
Tip: This to-scale comparison of Bouvet Island vs. Vanuatu uses the Mercator projection, which distorts the size of regions near the poles.